400550091 has 4 divisors (see below), whose sum is σ = 534066792. Its totient is φ = 267033392.

The previous prime is 400550089. The next prime is 400550099. The reversal of 400550091 is 190055004.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 400550091 - 2¹ = 400550089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (400550099) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66758346 + ... + 66758351.

It is an arithmetic number, because the mean of its divisors is an integer number (133516698).

Almost surely, 2^400550091 is an apocalyptic number.

400550091 is a deficient number, since it is larger than the sum of its proper divisors (133516701).

400550091 is a wasteful number, since it uses less digits than its factorization.

400550091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133516700.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 400550091 is about 20013.7475501216. The cubic root of 400550091 is about 737.1439037764.

The spelling of 400550091 in words is "four hundred million, five hundred fifty thousand, ninety-one".